Get started on a journey of discovery and wonder! Astronomy for Kids » Intro to the Sky » Urban Skies » Equipment » Glossary » NASA and DOE collaborate on dark energy research The Joint Dark Energy Mission will meaure the expansion rate of the universe and its growth structure. Recent Articles Scientists discover new planet 11/20/2008 Mysterious source of high-energy cosmic radiation discovered 11/19/2008 Black holes are the rhythm at the heart of galaxies 11/18/2008 More news » News Feed | What is RSS? On the road: Arizona Sky Village videos We've uploaded all five videos Editor David J. Eicher and Senior Editor Michael Bakich took during their trip to Arizona Sky Village. Video categories Product showcase Astronomy update How to Trips and tours See more videos » One small step for ... Ooops! 11/19/2008 08:47 AM New Mars rover naming contest 11/18/2008 04:58 PM Teaching future scientists 11/17/2008 11:09 AM Podcast: Night-sky targets for November 14-21, 2008 The Pleiades star cluster, open cluster M34, and the Little Dumbbell Nebula are visible in the next few days. Listen Subscribe to podcast » Podcast archive » Astronomy magazine subscribers have exclusive access to this premium content and more. Share your opinions and images or get advice from other Astronomy.com members. Go » Who is your favorite astronomy popularizer, living or dead? Carl Sagan Jack Horkheimer Sir Patrick Moore Stephen Hawking Other    Show Results » Customer service » Letter to the editor » Submit a group or event »